最新刊期
- “在显示技术领域，研究人员开发了柠檬酸配体，有效提升钙钛矿纳米晶发光二极管性能，为光电探测器等应用提供新方法。”摘要：Metal halide perovskite nanocrystals （CsPbX3） have emerged as promising candidate materials for display technologies due to their excellent optoelectronic properties. However， the weak coordination and long-chain structure of conventional ligands， such as oleic acid and oleylamine （OA/OLA）， result in surface defects and hindered carrier transport， which significantly limit the performance enhancement of perovskite light-emitting diodes （PeLEDs）. In this study， a short-chain， strongly chelating citric acid （CA） ligand was introduced. This ligand forms both coordination bonds and hydrogen bonds with the CsPbBr3 surface through its carboxyl （-COOH） and hydroxyl （-OH） functional groups， effectively passivating surface defects of the nanocrystals. Experimental results combined with density functional theory （DFT） calculations demonstrate that the adsorption energy of citric acid ligands is considerably higher than that of traditional OA/OLA ligands. This leads to a more uniform nanocrystal size distribution， significantly enhanced photoluminescence quantum yield （PLQY）， and a substantial reduction in the non-radiative recombination rate. Green-emitting PeLEDs based on citric acid-modified CsPbBr3 nanocrystals exhibit excellent electroluminescent performance， achieving a peak external quantum efficiency （EQE） of 13.58% and a peak current efficiency of 42.93 cd/A. This study presents a novel strategy for surface defect engineering of perovskites through cost-effective ligand design， and the multidentate chelating mechanism may be applicable to other optoelectronic devices such as photodetectors and solar cells.关键词：perovskite;light-emitting diode;ligands;external quantum efficiency4|0|0更新时间：2025-12-11
- “在有机发光二极管领域，研究者采用p型掺杂层PEDOT：PSS制备器件，发现漏电流影响器件性能，为高亮度应用提供见解。”摘要：OLEDs have been prepared using a p-doped layer poly（3，4-ethylenedioxythiophene）：poly（styrene sulfonate） （PEDOT：PSS） for hole injection， whereby the effects of leakage （electron） current on the PEDOT：PSS and device performances have been investigated. It is found that some injected electrons leak into PEDOT：PSS via the shunt paths formed due to the inevitable cathode diffusion through device， reducing PEDOT cations to neutral PEDOT molecules. This markedly decreases the conductivity of PEDOT：PSS， causing the saturations and even degradations of the current density and luminance of devices at high driving voltage. Increasing the thickness of either emissive or electron-blocking layer， using the smoother-surface electron-blocking layer and adopting n-doped electron transport layer all help suppress the diffusion of metal atoms and decrease the formation of parallel paths， which will alleviate the electron leakage and thereby increase the width of exciton formation zone and the device stability. The current research provides some useful and practical insights into the development of p-i-n organic light-emitting diodes towards high-luminance applications， such as electrically pumped organic lasers and microdisplays.关键词：organic light-emitting diodes;electron leakage;conductivity decrease;p-doped hole transport layer;device performance;stability98|77|0更新时间：2025-12-09
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Fluorine Substitution Site Effects on the Electroluminescent Properties of Platinum(II) Complexes AI导读
“最新研究揭示，通过调控氟原子取代位置，可有效调节环金属化铂（II）配合物的发光特性，为高性能有机发光材料和器件的分子设计提供新策略。”摘要：Three new cyclometalated platinum（II） complexes， PtB， PtB-F-2， and PtB-F-1， were designed and synthesized to systematically investigate the influence of fluorine substitution sites on their photophysical and electroluminescent properties. The structures of these complexes were confirmed by 1H/13C NMR and mass spectrometry. Combined experimental characterization and theoretical calculations were employed to elucidate the regulatory effect of fluorine substituents on the photophysical and electrochemical behaviors of the complexes. The results reveal that the substitution position of the fluorine atom has a pronounced impact on the emission spectra. Compared with the non-fluorinated PtB， PtB-F-2 exhibits a red-shifted emission， whereas PtB-F-1 shows a blue-shifted emission. In degassed dichloromethane solutions at room temperature， all complexes display bright green emission in the range of 505–533 nm， with photoluminescence quantum yields of 20.1–27.2% and lifetimes of 1.96–3.87 μs. When applied as the emissive dopants in organic light-emitting devices， the corresponding devices exhibit intense green electroluminescence with maximum external quantum efficiencies （EQEs） of 19.4–22.2% and maximum luminance values of 24，761–30， 316 cd·m-2. Among them， PtB-F-1 and its device demonstrate the best photoluminescent and electroluminescent performance. This study highlights that precise modulation of fluorine substitution sites within the PtB backbone effectively tunes the emission characteristics of Pt（II） complexes， offering a feasible molecular design strategy for high-performance organic light-emitting materials and devices.关键词：organic light-emitting diodes;fluorine substitution site effect;platinum（II） complexes;electroluminescent properties17|12|0更新时间：2025-12-09 - “在发光材料领域，研究人员以Ba3Ca2（PO4）3Cl为基质，成功制备出具有优异青色余辉性能的荧光粉，为青色长余辉磷光材料研究与应用提供重要参考。”摘要：Cyan long-persistent luminescent materials are relatively rare. In this work， Ba3Ca2（PO4）3Cl was chosen as the host， and a phosphor with excellent cyan afterglow performance was successfully prepared via high-temperature solid-state reaction. Its optical information storage behavior was also investigated. The detailed crystal structure parameters of the host were determined through structural refinement， and its density of states was calculated. Under 349 nm excitation， both Eu2+-doped and Eu2+/Ho3+ co-doped samples exhibited bright cyan emission， with the emission spectra showing two distinct peaks at 455 nm and 493 nm， corresponding to the characteristic 4f65d1-4f7 transitions of Eu2+ at different lattice sites. Compared with the single doped samples， the introduction of Ho3+ created new trap levels in the system， significantly enhancing the cyan afterglow performance. Finally， the afterglow mechanism and optical information storage behavior of the material were further analyzed， providing important reference for the study and application of cyan long-persistent phosphors.关键词：long-persistent phosphor;Eu2+-doped;Ho3+-doped;thermoluminescence;optical information storage15|3|0更新时间：2025-12-08
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Recent Advances in the Synthesis of Metal-Organic Cages with Aggregation-Induced Emission Properties 增强出版 AI导读
“最新研究进展显示，具有AIE特性的金属有机笼在合成策略上取得突破，为生物成像等领域提供广阔应用前景。”摘要：Metal-organic cages （MOCs） are discrete supramolecular architectures formed through the coordination-driven self-assembly of metal ions and organic ligands. These structures have garnered significant attention owing to their tunable geometries， diverse cavity configurations， and facile functionalization capabilities. In recent years， the rapid advancement of aggregation-induced emission （AIE） materials， along with their distinctive advantages in luminescence mechanisms and functional design， has offered novel insights and opportunities for the development of innovative MOCs. This article provides an overview of the most recent advancements in the synthetic strategies for MOCs exhibiting AIE properties， with particular emphasis on the construction of AIE-active MOCs through the coordination-driven self-assembly of AIE chromophores， such as tetraphenylethylene （TPE） and carbazole， with center metals including Pt（II）， Zn（II）， Pd（II）， and Cd（II）. This class of compounds demonstrates not only superior optical properties but also extensive application potential across various advanced fields， including bioimaging， chemical and biological sensing， information storage and encryption， and light-harvesting systems.关键词：Metal-organic cages;aggregation-induced emission;tetraphenylethylene;Supramolecular self-assembly15|5|0更新时间：2025-12-08 - “在环境监测领域，研究人员通过拉曼光谱研究二氧化钼二维薄膜厚度，为监控膜厚提供有效手段。”摘要：Monoclinic-phase molybdenum dioxide （m-MoO₂） two-dimensional （2D） flakes exhibit outstanding properties comparable to those of noble metals， with tunable performance depending on flake thickness. This makes it highly promising for applications in areas such as environmental monitoring and wastewater sensing. One of prerequisites for achieving high-performance MoO2-based devices is the development of an in-situ， rapid， and non-destructive method for measuring flake thickness. In this work， the dependence of the Raman spectra of MoO₂ 2D thin flakes on flake thickness is investigated， providing a method for in-situ， non-destructive thickness characterization. Excited with 532 nm laser， the shift in the Raman characteristic peak at 127 cm-1 effectively reflects the variation in flake thickness. Furthermore， by adjusting the polarization of the excitation light， the crystal axis orientation of the MoO2 thin flake can be calibrated. The Raman spectroscopic results thus offer an effective and convenient approach for monitoring the flake thickness in MoO2-based device fabrication.关键词：m-MoO2 flakes;Raman spectroscopy;in situ non-destructive detection31|4|0更新时间：2025-12-06
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Blue Bipolar Host Materials Achieved through Electronic Decoupling via a Twisted Biphenyl Skeleton 增强出版 AI导读
“本报道介绍了蓝光磷光器件领域新策略，通过空间位阻电子解耦设计主体材料，实现高三线态能级与载流子传输平衡，为提升器件效率提供新思路。”摘要：Addressing the persistent challenge in blue phosphorescent devices of balancing high triplet energy levels with balanced charge carrier transport in host materials， this study proposes a novel "spatial hindrance-induced electronic decoupling" strategy. By constructing D-A-type host materials （N，N-diphenyl-2'-tosyl-［1，1'-biphenyl］-2-amine/N，N-di-p-tolyl-2'-tosyl-［1，1'-biphenyl］-2-amine） with multiple twisted conformations via the 2，2'-position of a biphenyl skeleton， a synergistic combination of a high triplet energy level （2.66 eV） and bipolar charge transport properties was successfully achieved. Theoretical calculations and experimental characterizations confirm that spatial hindrance effectively suppresses electronic coupling between the donor and acceptor units， maintaining a high-energy structure dominated by localized excited states. Device performance validated the advantages of this strategy in exciton confinement and charge carrier balance， while also revealing limitations in efficiency due to molecular conformational dynamic instability. This study identifies the dynamic conformational stability of molecules as a critical constraint on device efficiency in steric-hindrance-based blue host materials， thus providing a clear design principle for performance breakthrough through enhanced structural rigidity.关键词：biphenyl skeleton;host material;steric hindrance15|4|0更新时间：2025-12-04 -
Recyclable Iron Oxide Decorated MoS2 Nanosheets for Photocatalytic Degradation of Tetracycline 增强出版 AI导读
“In the field of wastewater treatment, researchers have developed a recyclable Fe3O4-MoS2 nanocomposite with enhanced photocatalytic performance. The nanocomposite, characterized by various techniques, achieved 90% degradation of tetracycline under visible light within 150 minutes, demonstrating its potential as a promising photocatalyst.”摘要：In this work， we report a fabrication of recyclable iron oxide decorated MoS2 nanosheets via a facile liquid exfoliation approach and solvothermal reaction for visible-light photodegradation of tetracycline. The prepared Fe3O4-MoS2 were characterized by X-ray diffraction， transmission electron microscopy， X-ray photoelectron spectroscopy， Raman spectroscopy， magnetic hysteresis， and nitrogen adsorption–desorption isotherms. Experimental results indicate that， successful attachment of Fe3O4 nanoparticles to MoS2 sheets has been achieved. The enhanced surface area of Fe3O4-MoS2 induced high rates of adsorption and the adsorbed tetracycline was degraded to 90 % after 150 min of visible exposure， which is better than that from pure MoS2. The introduction of Fe3O4 not only enhances the photocatalytic performance of Fe3O4-MoS2， but also enables its convenient recovery from water by an external magnetic field. Furthermore， both the photocatalytic activity and composite phase of Fe3O4-MoS2 were well-retained over cycles. Owing to its efficient photocatalytic activity， good stability and magnetic recyclability， the Fe3O4-MoS2 nanocomposite is considered to be a promising photocatalyst for wastewater treatment.关键词：Fe3O4;MoS2;photocatalyst;magnetic recyclability23|5|0更新时间：2025-12-03 - “钙钛矿太阳能电池研究取得新进展，提出2D/3D异质结构协同钝化策略，显著提升光电转换效率和稳定性。”摘要：Perovskite solar cells （PSCs） show great promise owing to their remarkable optoelectronic performance， yet their commercial deployment is hindered by intrinsic instability. We introduce a synergistic 2D/3D heterostructure passivation approach， integrating a TAI-derived 2D perovskite capping layer with the TEMPO radical scavenger to concurrently mitigate grain boundary defects and radical-induced degradation. This strategy improves perovskite crystallinity and film uniformity， lowering the surface roughness from 9.60 nm to 6.25 nm. Carrier lifetime extends from 250 ns to 355 ns， as confirmed by steady-state and time-resolved photoluminescence， indicating suppressed non-radiative recombination. The 2D/3D-based devices demonstrate enhanced recombination resistance （383.7 Ω） and superior charge transport， yielding a champion efficiency of 21.15%. The device retained 71.5% of its initial efficiency after 20 days in a damp-heat environment. This study offers a new materials design paradigm toward efficient and operationally stable perovskite photovoltaics.关键词：perovskite solar cells;Two-dimensional passivation;Heterojunction structure;Radical scavenging;device stability19|10|0更新时间：2025-12-01
- “In the field of semiconductor lighting, a circuit model of single-quantum-well InGaN/GaN light-emitting diodes is presented. Expert established the model based on standard rate equations, which provides solutions to solve the static and dynamic performance problems of LEDs.”摘要：In this paper， we present a circuit model of single-quantum-well InGaN/GaN light-emitting diodes based on the standard rate equations. Two rate equations describe carrier transport proesses occurrings in separate confinement heterostructure and quantum well respectively， and the third equation describes the varied photons in quanum well. By using the presented model， impacts of quantum well thickness on the static and dynamic performances are investigated. Simulated results show that LED with 4 nm well exhibits better light-current （L-I） performance， but LED with 3 nm well presents wider 3 dB modulation bandwidth. It reveals that high carrier density in quantum well is detrimental to the static performance， but beneficial to the dynamic performance.关键词：single quantum well;Rate equations;Circuit model;L-I performance;modulation bandwidth31|5|0更新时间：2025-12-01
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Simulation Study of N-Polar InGaN-Based Red LEDs with Superlattice Electron Deceleration Layer 增强出版 AI导读
“在氮化物RGB全彩Micro-LED显示技术领域，研究人员提出了一种新型InGaN基红光LED结构，有效提升发光效率，为高发光效率InGaN基红光Micro-LED制备提供新思路。”摘要：The low emission efficiency of InGaN-based red LEDs remains a critical bottleneck for realizing full-color nitride-based RGB Micro-LED displays. Enhancing carrier confinement and crystalline quality in the quantum well （QW） active region is essential to improving optical performance. Here， we propose an N-polar InGaN-based red LED featuring an n-In0.1Ga0.9N/GaN superlattice electron deceleration layer （EDL） while removing the conventional p-AlGaN electron blocking layer （EBL）. Numerical simulations show that the superlattice EDL effectively reduces electron thermal velocity and increases electron capture efficiency within the QWs. Meanwhile， the design maintains a high electron confinement barrier and lowers the hole injection barrier， improving hole capture efficiency and suppressing electron overflow. Compared with a reference N-polar InGaN based red LED with a p-AlGaN EBL， the proposed device achieves a 16% increase in peak internal quantum efficiency and a 32% rise in optical output power. Furthermore， eliminating the p-AlGaN EBL avoids QW crystal degradation caused by high-temperature AlGaN growth， offering a promising route toward high-efficiency InGaN-based red Micro-LEDs.关键词：InGaN;red light-emitting diodes;nitrogen polarity;electron deceleration layer37|8|0更新时间：2025-11-27 - “葡萄糖代谢异常与疾病紧密相关，光学传感技术有望改善糖尿病监测体验，为糖尿病管理提供新工具。”摘要：Glucose is an essential energy source for living organisms， and its metabolic abnormalities are closely associated with various diseases such as diabetes and cancer. Electrochemical detection methods， with their high precision， are currently the primary clinical approach for blood glucose monitoring. However， optical sensing， owing to its noninvasive or minimally invasive nature and capability for long-term continuous monitoring， not only has the potential to improve the monitoring experience of diabetic patients but may also become an important tool in future diabetes management. This review systematically summarizes recent advances in subcutaneous continuous glucose monitoring and tumor glucose metabolism monitoring， with a particular emphasis on the design principles and performance of fluorescence- and phosphorescence-based sensing platforms. Furthermore， we analyze the existing problems and challenges in continuous glucose monitoring technologies and provide our perspective on future development.关键词：in vivo glucose monitoring;tumor glucose metabolism;optical sensing;fluorescence;phosphorescence35|19|0更新时间：2025-11-24
- “最新研究发现，由辛二胺与丁二酸自组装而成的超分子化合物PA84S，具有独特的荧光特性，可开发为新型荧光探针，用于高灵敏度检测Fe3+离子及四环素。”摘要：In contrast to conventional supramolecular polymers focusing on mechanical properties， this work investigates the photophysical performance of supramolecular materials， reporting a fully water-soluble aliphatic supramolecular compound （PA84S） self-assembled from octanediamine and succinic acid via ionic and hydrogen bonds. PA84S exhibits unique concentration-dependent and excitation-dependent fluorescence in aqueous solution， originating from cluster-triggered emission within the supramolecular structure. By integrating dynamic light scattering， pyrene fluorescence probing， Zeta potential， and conductivity measurements， the self-assembly behavior of PA84S were systematically characterized， confirming the formation of ordered aggregates through synergistic interactions in water and determining the critical aggregation concentration for fluorescence. The emission enhancement directly related to heteroatom clusters constructed by ionic bonds （-COO-·+NH3-） and hydrogen bonds， where through-space conjugation creates luminescent channels while restricting intramolecular motions. Leveraging this unique fluorescence， PA84S serves as a novel supramolecular probe for selective and highly sensitive detection of Fe3+ ions and tetracycline. This work provides a new strategy for constructing water-soluble luminescent materials from non-conjugated building blocks and demonstrates the potential of supramolecular assemblies in fluorescence sensing applications.关键词：Amide salt;supramolecular assembly;cluster-triggered emission;fluorescence sensing;ion detection37|61|0更新时间：2025-11-19
- “在紫外保健灯领域，研究人员采用高温固相法制备了Sr6GdAl（BO3）6：xDy3+荧光粉，研究了其晶体结构、发光特性、能量传递机理、荧光衰减曲线、色坐标和变温光谱。”摘要：The Sr6GdAl（BO3）6：xDy3+ phosphors were synthesized by high-temperature solid-state reaction. The crystal structure， luminescence properties， energy transfer mechanisms， photoluminescence decay curves， CIE coordinates and temperature dependent emission spectra were investigated. Under UV excitation， the emission peak at 315 nm is attributed to the 6P7/2 → 8S7/2 transition of Gd3+， the emission peaks at 484 nm and 578 nm are attributed to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions of Dy3+， the Sr6GdAl（BO3）6：xDy3+ phosphors exhibited white emission. The CIE coordinates of the samples with different Dy3+ concentrations were close to the ideal white point （x = 0.33， y = 0.33） in the CIE chromaticity diagram. Energy transfer from Gd3+ to Dy3+ was observed in the samples， with an efficiency as high as 90.59%. A negative thermal quenching effect was observed， where the emission intensity at 543 K was maintained at 103.6% of the room-temperature value， indicating excellent thermal stability. These results indicated that Sr6GdAl（BO3）6 is identified as a potential phosphor for UV healthcare lamps. Furthermore， the Dy³⁺-doped Sr₆GdAl（BO₃）₆：xDy³⁺ is a white-light-emitting phosphor that can be excited by ultraviolet light.关键词：phosphors;Dy3+ doped;energy transfer;photoluminescence36|20|0更新时间：2025-11-17
- “在智能纺织品领域，研究者提出了钙钛矿基ACEL纤维解决方案，攻克了材料光电响应机制与柔性基底协同适配难题，为智能纺织品开发高色域柔性光源提供了产业化技术路径。”摘要：In response to the urgent demand for electroluminescent devices in smart textiles， this study proposes a novel perovskite-based alternating current electroluminescence （ACEL） fiber solution. Focusing on the characteristic that perovskite quantum dots， despite their excellent color purity， cannot directly respond to alternating current， a technical breakthrough is achieved by constructing a CsPbBr3/ZnS/TPU composite system： wet spinning is used to continuously prepare coaxial fibers， and the Förster energy resonance transfer mechanism between ZnS and CsPbBr3 is utilized to effectively convert alternating current energy into light radiation， with flexible encapsulation achieved through thermoplastic polyurethane （TPU）. The obtained fibers exhibit narrow-band pure green emission （CIE coordinates 0.2138， 0.6425） under alternating current fields， maintaining over 82% of their initial brightness after 500 mechanical bends， and possess excellent pattern weaving construction capabilities. This research overcomes the challenge of the coordinated adaptation of the material's photoelectric response mechanism and flexible substrate in wearable optoelectronic devices， providing an industrializable technical path for the development of high-color-domain flexible light sources and dynamic interactive interfaces in smart textiles.关键词：perovskite;AC electroluminescence;Coaxial wet spinning;Energy resonance transfer;Weavable patterning85|26|0更新时间：2025-11-12
- “生物荧光成像技术取得新进展，NIR-II激发荧光染料助力精准诊疗，为临床诊断和治疗提供新思路。”摘要：The quality of biological fluorescence imaging is determined not only by the emissive brightness of the organic dyes but also by the excitation wavelength. The longer the excited wavelength， the weaker the light-tissue interaction， which can reduce photon scattering and effectively lower tissue absorption and autofluorescence. This helps improve signal-to-background ratio， spatial and temporal resolution， and penetration depth. Therefore， fluorescence imaging excited by the second near-infrared window （NIR-II） enables deeper and more precise biological imaging and detection， offering greater potential for clinical diagnosis and therapy of disease. This review first explains the principles and advantages of NIR-II fluorescence imaging， then reviews the molecular design strategy and research progress of several important classes of NIR-II-excited fluorescent dyes and their applications in medical diagnostics of NIR-II fluorescent probes and the challenges in clinical translation， with an outlook on future development directions.关键词：NIR-II;fluorescence imaging;organic fluorophores;benzothiadiazole37|28|0更新时间：2025-11-04
- “最新研究发现，柠檬酸和乙二胺制备的碳点复合到MOF-76（Tb）中，制备出CDs@MOF-76（Tb）复合材料，展现出优异的环境耐受性和荧光传感器应用潜力。”摘要：In this study， carbon dots （CDs） were prepared by hydrothermal method using citric acid and ethylenediamine as precursors， and the CDs were synthesized into the pore structure of MOF-76（Tb） by in-situ encapsulation strategy. CDs@MOF-76（Tb） composite material was successfully prepared. The composite not only maintains the structural stability of MOF-76（Tb） frame， but also possesses the luminescence characteristics of CDs and MOF-76（Tb）. After heat treatment， long-term immersion in aqueous solution， 0.0-1.0M NaCl solution and pH=3-11 and other environmental conditions， the material showed excellent environmental tolerance， showing its application potential as a fluorescence sensor. In addition， CDs@MOF-76（Tb） composites show high selectivity and sensitivity for the detection of Cr（VI） anions （including CrO42- and Cr2O72-） in aqueous environment， and their quenching effect constants KSV are 5.01×103 M-1 and 1.13×104 M-1， respectively. Detection limits （LOD） were 1.06 μM and 0.47 μM， respectively. At the same time， the material can also be used as a ratio fluorescent probe to selectively detect Bi（III） ions with KSV of 4.53×103 M-1 and the LOD of 1.01 μM. Therefore， CDs@MOF-76（Tb） composite has good anti-interference and cycling stability to target detection objects， and has broad application prospects in the field of environmental monitoring.关键词：carbon dots;metal-organic frameworks materials;composite material;ratio fluorescent probe;inorganic ion detection40|16|0更新时间：2025-11-04
- “在有机发光二极管领域，研究者通过优化荧光/磷光混合型白光器件结构，制备出高效率、低滚降的WOLEDs，最大外量子效率达25.31%，色度坐标为（0.43，0.43），实现标准暖白光发射。”摘要：This paper mainly investigates the device structure of fluorescent/phosphorescent hybrid WOLEDs and their impact on exciton utilization， and further analyzes its underlying mechanism. In the fabricated WOLEDs， the emissive layer is composed of an aggregation-induced emission （AIE） materials TPB-PAC exhibiting high fluorescent quantum efficiency in film and an ultrathin yellow phosphorescent layer of Ir（tptpy）2（acac） incorporated into the TPB-PAC layer. It is experimentally found that the position of the inserted phosphorescent ultra-thin layer significantly influences the device performances. Through optimized the ultra-thin layer， the high-efficiency， low-roll-off two-color fluorescent/phosphorescent hybrid WOLEDs with a maximum external quantum efficiency （EQE） of 25.31%， a power efficiency of 85.80 lm W-¹， and a current efficiency of 81.34 cd A-¹ are achieved. At the luminance of 1000 cd m-2， the EQE keeps 23.19% with CIE coordinates （0.43，0.43）， exhibiting standard warm white light emission.关键词：organic light-emitting diode;white light;aggregation-induced emission;ultra-thin layer39|20|0更新时间：2025-11-04
- “In the field of organic light-emitting diodes (OLEDs), researchers have made significant progress. They designed and synthesized blue phosphorescent bipolar host materials based on different biphenyl linking sites, which effectively regulate the properties of host materials. This work provides an effective strategy for the development of high-efficiency blue phosphorescent hosts.”摘要：Theoretically， blue phosphorescent materials are capable of achieving 100% internal quantum efficiency. Nevertheless， the mutual constraints among efficiency， color purity， and stability remain one of the key bottlenecks in the industrialization of organic light-emitting diodes （OLEDs）. In addition， the design and application of host materials also exert a significant impact on the overall performance of blue light-emitting devices. To address this issue， this study constructs a series of host materials with high triplet energy levels by designing different connection modes， based on 9-phenylcarbazole and benzimidazole units. Through a combination of theoretical and experimental approaches， the correlation between the chemical structure and performance has been unraveled. It is found that the designed and synthesized blue phosphorescent bipolar host materials based on different biphenyl linking sites， i.e.， 9-（3'-（1-phenyl-1H-benzo［d］imidazol-2-yl）-［1，1'-biphenyl］-3-yl）-9H-carbazole （mCzmBI）， 9-（2'-（1-phenyl-1H-benzo［d］imidazol-2-yl）-［1，1'-biphenyl］-3-yl）-9H-carbazole （mCzoBI） and 9-（3'-（1-phenyl-1H-benzo［d］imidazol-2-yl）-［1，1'-biphenyl］-2-yl）-9H-carbazole （oCzmBI）. The three compounds have a similar triplet energy level of 2.70 eV， accompanied with the glass transition temperatures of 92°C， 103°C， and 93°C respectively. mCzmBI， mCzoBI and oCzmBI are regioisomers， but differ in the linking sites of carbazole and benzimidazole on the biphenyl linker. This difference in linking positions enables effective regulation of the host materials’ properties. Constructed with the blue phosphorescent material bis（4，6-difluorophenylpyridinato-N，C2）picolinatoiridium（III） （FIrpic） as the guest， the influence of the three hosts on device performance is clarified. Overall， the device using mCzmBI， a host linked by biphenyl at double meta-positions， achieved a maximum current efficiency of 24.9 cd/A and a maximum external quantum efficiency exceeding 12.8%， it also demonstrates low efficiency roll-off under high-brightness conditions. This work offers an effective strategy to the development of high-efficiency blue phosphorescent hosts.关键词：Blue phosphorescent;Organic electroluminescence;9-phenylcarbazole;Benzimidazole;Host materials48|35|0更新时间：2025-11-04
- “在新一代显示技术领域，研究者引入六方氮化硼材料，有效提升量子点发光二极管性能，为显示技术发展提供新思路。”摘要：Quantum dot light-emitting diode （QLED） have emerged as a novel class of next-generation displays， with zinc oxide （ZnO） serving as a critical electron transport layer （ETL）. However， the high electron mobility of ZnO often gives rise to unbalanced charge injection into the emissive layer （EML）. Meanwhile， surface defects such as oxygen vacancies induce non-radiative recombination and luminescence quenching. Herein， we introduced hexagonal boron nitride （h-BN）， a typical two-dimensional material， as an electron barrier layer between EML and ZnO layer. Incorporating h-BN effectively mitigates the charge carrier imbalance and suppresses the luminescence quenching caused by ZnO. Ultimately， the modification enhances the external quantum efficiency （EQE） and current efficiency （CE） of the QLED device to 17.31 % and 18.80 cd/A， corresponding to relative increases of 12.34 % and 7.43 %， respectively， compared to reference devices. This innovative application of two-dimensional materials in QLED not only optimizes QLED device performance but also opens new avenues for the future utilization of such materials in display technology.关键词：QLED;hexagonal boron nitride;electron barrier layer;charge injection balance;interface modification70|32|0更新时间：2025-11-04
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